Map Reading and Land Navigation Flashcards
What document covers map reading and land navigation?
TC 3-25.26
What is a map?
A graphic representation of the Earth’s surface, drawn to scale as seen from above.
What is the purpose of a map?
To provide accurate information about the existence, location, and distance between ground features like terrain, elevation, populated areas, routes of travel and communication.
How many Norths are there on a military map?
Three:
- True North
- Grid North
- Magnetic North
What does the color black stand for on a map?
It indicates man-made features like buildings and roads.
What does the color blue stand for on a map?
It identifies water features like lakes, swamps, rivers and drainage.
What does the color green stand for on a map?
It stands for vegetation with military significance, such as woods, orchards, or vineyards.
What does the color brown stand for on a map?
It identifies all relief features and elevation, as well as contour lines on older maps.
What does the color red stand for on a map?
It is used for cultural features such as populated areas, main roads, and on older maps it indicates boundaries.
What does the color reddish-brown stand for on a map?
It identifies all relief features and elevation, as well as contour lines on red light readable and newer maps.
How close will you get to a location with a six digit grid coordinate?
Within 100 meters.
How close will you get to a location with an eight digit grid coordinate?
Within 10 meters.
What is an azimuth?
It is a direction, a horizontal angle which is measured in degrees or mils from the North.
What are the five major terrain features of a map?
- Hill
- Valley
- Ridge
- Saddle
- Depression
What are the three minor terrain features of a map?
- Draw
- Spur
- Cliff
What are the two supplementary terrain features of a map?
- Cut
2. Fill
What are the two methods for holding a compass?
The centerfold technique and the compass-to-cheek technique.
How would you hold a lensatic compass?
Level and firm, away from electrical or metal equipment.
Describe the fastest way to orient a map.
Place a compass on a map and align it with the grid lines insuring that the compass needle points north.
How would you orient a map without a compass?
By aligning it with the observable terrain features.
What three elements are necessary for dead reckoning in land navigation?
- Known starting point
- Known distance
- Known azimuth.
Resection
The method of locating one’s position on a map by determining the grid azimuth to at
least two well-defined locations that can be pinpointed on the map.
Name several types of maps.
Topographic map, planimetric map, photomap, and terrain model.
Features of a map
a. Marginal information
b. Sheet name
c. Sheet number
d. Series name
e. Series number
f. Scale
g. Edition number
h. Credit line
i. Declination diagram
j. Bar scales
k. Contour interval
l. Legend
